During a sold-out concert at London’s O2 Arena on July 25, Cooper, donning an Osbourne T-shirt, led a powerful tribute to the late rock legend just days after his death was announced.

Hundreds of Black Sabbath fans gathered in Birmingham city centre to pay tribute to Ozzy Osbourne.

He became known as the Prince of Darkness and, relatedly, the godfather of heavy metal, which emerged as the name for the subgenre that flourished and then fractured in the wake of Black Sabbath’s su...